Antarctic Sea Ice Proxies from Marine and Ice Core Archives Suitable for Reconstructing Sea Ice over the past 2000 Years

Type Article
Date 2019-12
Language English
Author(s) Thomas Elizabeh R1, Allen Claire S1, Etourneau Johan2, 3, King Amy Cf1, Severi Mirko4, Winton V. Holly L.1, Mueller Juliane5, Crosta Xavier3, Peck Victoria L.1
Affiliation(s) 1 : British Antarctic Survey, Cambridge CB3 0ET, UK
2 : Ecole Pratique des Hautes Etudes, PSL Research University, 75014 Paris, France
3 : UMR 5805 EPOC CNRS, University of Bordeaux, 33400 Talence, France
4 : Dipartimento di Chimica “Ugo Schiff”, University of Florence, 50019 Firenze, Italy
5 : Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
Source Geosciences (2076-3263) (MDPI AG), 2019-12 , Vol. 9 , N. 12 , P. 506 (33p.)
DOI 10.3390/geosciences9120506
WOS© Times Cited 14
Note This article belongs to the Special Issue Climate Variability in Antarctica and the Southern Hemisphere over the Last Millennia
Keyword(s) sea ice, Antarctica, paleoclimate, ice cores, marine sediments
Abstract

Dramatic changes in sea ice have been observed in both poles in recent decades. However, the observational period for sea ice is short, and the climate models tasked with predicting future change in sea ice struggle to capture the current Antarctic trends. Paleoclimate archives, from marine sedimentary records and coastal Antarctic ice cores, provide a means of understanding sea ice variability and its drivers over decadal to centennial timescales. In this study, we collate published records of Antarctic sea ice over the past 2000 years (2 ka). We evaluate the current proxies and explore the potential of combining marine and ice core records to produce multi-archive reconstructions. Despite identifying 92 sea ice reconstructions, the spatial and temporal resolution is only sufficient to reconstruct circum-Antarctic sea ice during the 20th century, not the full 2 ka. Our synthesis reveals a 90 year trend of increasing sea ice in the Ross Sea and declining sea ice in the Bellingshausen, comparable with observed trends since 1979. Reconstructions in the Weddell Sea, the Western Pacific and the Indian Ocean reveal small negative trends in sea ice during the 20th century (1900–1990), in contrast to the observed sea ice expansion in these regions since 1979.

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Thomas Elizabeh R, Allen Claire S, Etourneau Johan, King Amy Cf, Severi Mirko, Winton V. Holly L., Mueller Juliane, Crosta Xavier, Peck Victoria L. (2019). Antarctic Sea Ice Proxies from Marine and Ice Core Archives Suitable for Reconstructing Sea Ice over the past 2000 Years. Geosciences, 9(12), 506 (33p.). Publisher's official version : https://doi.org/10.3390/geosciences9120506 , Open Access version : https://archimer.ifremer.fr/doc/00595/70709/